Dosha can be termed as a form of Bio-energy, which controls the body’s physiology. It is of three types, i.e. Vata, Pitta and Kapha. Vata governs movement. All voluntary and involuntary impulses are controlled by Vata. Pitta governs transformation in the body and mind. The digestive fire and the illuminating capacity of the mind are controlled by Pitta. Kapha governs form and substance. The weight, cohesion and the stability of the body and mind are controlled by Kapha.
In order to stay healthy, these three Doshas need to be balanced and in a state of equilibrium with each other. Otherwise there arises a condition of imbalanced Doshas that leads to a state of disease. We need to follow certain diet and life-style so that these three Doshas remain balanced. Improper diet and life-style leads to aggravation of these Doshas which gives rise to a state of disease. No one Dosha can control body’s physiology or sustain life. All three must work together in harmony. In a nutshell health is harmony and disharmony is disease. And the aim of Ayurveda is to maintain harmony in an individual which can be achieved by following a proper diet, lifestyle and medicinal regimen.